net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * utilities for mac80211
  13  */
  14
  15 #include <net/mac80211.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/export.h>
  18 #include <linux/types.h>
  19 #include <linux/slab.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/crc32.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27 #include <net/rtnetlink.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "mesh.h"
  33 #include "wme.h"
  34 #include "led.h"
  35 #include "wep.h"
  36
  37 /* privid for wiphys to determine whether they belong to us or not */
  38 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  39
  40 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  41 {
  42         struct ieee80211_local *local;
  43         BUG_ON(!wiphy);
  44
  45         local = wiphy_priv(wiphy);
  46         return &local->hw;
  47 }
  48 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  49
  50 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  51 {
  52         struct sk_buff *skb;
  53         struct ieee80211_hdr *hdr;
  54
  55         skb_queue_walk(&tx->skbs, skb) {
  56                 hdr = (struct ieee80211_hdr *) skb->data;
  57                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
  58         }
  59 }
  60
  61 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
  62                              int rate, int erp, int short_preamble,
  63                              int shift)
  64 {
  65         int dur;
  66
  67         /* calculate duration (in microseconds, rounded up to next higher
  68          * integer if it includes a fractional microsecond) to send frame of
  69          * len bytes (does not include FCS) at the given rate. Duration will
  70          * also include SIFS.
  71          *
  72          * rate is in 100 kbps, so divident is multiplied by 10 in the
  73          * DIV_ROUND_UP() operations.
  74          *
  75          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
  76          * is assumed to be 0 otherwise.
  77          */
  78
  79         if (band == IEEE80211_BAND_5GHZ || erp) {
  80                 /*
  81                  * OFDM:
  82                  *
  83                  * N_DBPS = DATARATE x 4
  84                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
  85                  *      (16 = SIGNAL time, 6 = tail bits)
  86                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
  87                  *
  88                  * T_SYM = 4 usec
  89                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
  90                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
  91                  *      signal ext = 6 usec
  92                  */
  93                 dur = 16; /* SIFS + signal ext */
  94                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
  95                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
  96
  97                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
  98                  *  * times 4 for 5 MHz
  99                  *  * times 2 for 10 MHz
 100                  */
 101                 dur *= 1 << shift;
 102
 103                 /* rates should already consider the channel bandwidth,
 104                  * don't apply divisor again.
 105                  */
 106                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 107                                         4 * rate); /* T_SYM x N_SYM */
 108         } else {
 109                 /*
 110                  * 802.11b or 802.11g with 802.11b compatibility:
 111                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 112                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 113                  *
 114                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 115                  * aSIFSTime = 10 usec
 116                  * aPreambleLength = 144 usec or 72 usec with short preamble
 117                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 118                  */
 119                 dur = 10; /* aSIFSTime = 10 usec */
 120                 dur += short_preamble ? (72 + 24) : (144 + 48);
 121
 122                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 123         }
 124
 125         return dur;
 126 }
 127
 128 /* Exported duration function for driver use */
 129 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 130                                         struct ieee80211_vif *vif,
 131                                         enum ieee80211_band band,
 132                                         size_t frame_len,
 133                                         struct ieee80211_rate *rate)
 134 {
 135         struct ieee80211_sub_if_data *sdata;
 136         u16 dur;
 137         int erp, shift = 0;
 138         bool short_preamble = false;
 139
 140         erp = 0;
 141         if (vif) {
 142                 sdata = vif_to_sdata(vif);
 143                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 144                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 145                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 146                 shift = ieee80211_vif_get_shift(vif);
 147         }
 148
 149         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 150                                        short_preamble, shift);
 151
 152         return cpu_to_le16(dur);
 153 }
 154 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 155
 156 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 157                               struct ieee80211_vif *vif, size_t frame_len,
 158                               const struct ieee80211_tx_info *frame_txctl)
 159 {
 160         struct ieee80211_local *local = hw_to_local(hw);
 161         struct ieee80211_rate *rate;
 162         struct ieee80211_sub_if_data *sdata;
 163         bool short_preamble;
 164         int erp, shift = 0, bitrate;
 165         u16 dur;
 166         struct ieee80211_supported_band *sband;
 167
 168         sband = local->hw.wiphy->bands[frame_txctl->band];
 169
 170         short_preamble = false;
 171
 172         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180                 shift = ieee80211_vif_get_shift(vif);
 181         }
 182
 183         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 184
 185         /* CTS duration */
 186         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 187                                        erp, short_preamble, shift);
 188         /* Data frame duration */
 189         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 190                                         erp, short_preamble, shift);
 191         /* ACK duration */
 192         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 193                                         erp, short_preamble, shift);
 194
 195         return cpu_to_le16(dur);
 196 }
 197 EXPORT_SYMBOL(ieee80211_rts_duration);
 198
 199 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 200                                     struct ieee80211_vif *vif,
 201                                     size_t frame_len,
 202                                     const struct ieee80211_tx_info *frame_txctl)
 203 {
 204         struct ieee80211_local *local = hw_to_local(hw);
 205         struct ieee80211_rate *rate;
 206         struct ieee80211_sub_if_data *sdata;
 207         bool short_preamble;
 208         int erp, shift = 0, bitrate;
 209         u16 dur;
 210         struct ieee80211_supported_band *sband;
 211
 212         sband = local->hw.wiphy->bands[frame_txctl->band];
 213
 214         short_preamble = false;
 215
 216         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 217         erp = 0;
 218         if (vif) {
 219                 sdata = vif_to_sdata(vif);
 220                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 221                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 222                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 223                 shift = ieee80211_vif_get_shift(vif);
 224         }
 225
 226         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 227
 228         /* Data frame duration */
 229         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 230                                        erp, short_preamble, shift);
 231         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 232                 /* ACK duration */
 233                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 234                                                 erp, short_preamble, shift);
 235         }
 236
 237         return cpu_to_le16(dur);
 238 }
 239 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 240
 241 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 242 {
 243         struct ieee80211_sub_if_data *sdata;
 244         int n_acs = IEEE80211_NUM_ACS;
 245
 246         if (local->hw.queues < IEEE80211_NUM_ACS)
 247                 n_acs = 1;
 248
 249         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 250                 int ac;
 251
 252                 if (!sdata->dev)
 253                         continue;
 254
 255                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 256                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 257                         continue;
 258
 259                 for (ac = 0; ac < n_acs; ac++) {
 260                         int ac_queue = sdata->vif.hw_queue[ac];
 261
 262                         if (local->ops->wake_tx_queue &&
 263                             (atomic_read(&sdata->txqs_len[ac]) >
 264                              local->hw.txq_ac_max_pending))
 265                                 continue;
 266
 267                         if (ac_queue == queue ||
 268                             (sdata->vif.cab_queue == queue &&
 269                              local->queue_stop_reasons[ac_queue] == 0 &&
 270                              skb_queue_empty(&local->pending[ac_queue])))
 271                                 netif_wake_subqueue(sdata->dev, ac);
 272                 }
 273         }
 274 }
 275
 276 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 277                                    enum queue_stop_reason reason,
 278                                    bool refcounted)
 279 {
 280         struct ieee80211_local *local = hw_to_local(hw);
 281
 282         trace_wake_queue(local, queue, reason);
 283
 284         if (WARN_ON(queue >= hw->queues))
 285                 return;
 286
 287         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 288                 return;
 289
 290         if (!refcounted)
 291                 local->q_stop_reasons[queue][reason] = 0;
 292         else
 293                 local->q_stop_reasons[queue][reason]--;
 294
 295         if (local->q_stop_reasons[queue][reason] == 0)
 296                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 297
 298         if (local->queue_stop_reasons[queue] != 0)
 299                 /* someone still has this queue stopped */
 300                 return;
 301
 302         if (skb_queue_empty(&local->pending[queue])) {
 303                 rcu_read_lock();
 304                 ieee80211_propagate_queue_wake(local, queue);
 305                 rcu_read_unlock();
 306         } else
 307                 tasklet_schedule(&local->tx_pending_tasklet);
 308 }
 309
 310 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 311                                     enum queue_stop_reason reason,
 312                                     bool refcounted)
 313 {
 314         struct ieee80211_local *local = hw_to_local(hw);
 315         unsigned long flags;
 316
 317         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 318         __ieee80211_wake_queue(hw, queue, reason, refcounted);
 319         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 320 }
 321
 322 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 323 {
 324         ieee80211_wake_queue_by_reason(hw, queue,
 325                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 326                                        false);
 327 }
 328 EXPORT_SYMBOL(ieee80211_wake_queue);
 329
 330 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 331                                    enum queue_stop_reason reason,
 332                                    bool refcounted)
 333 {
 334         struct ieee80211_local *local = hw_to_local(hw);
 335         struct ieee80211_sub_if_data *sdata;
 336         int n_acs = IEEE80211_NUM_ACS;
 337
 338         trace_stop_queue(local, queue, reason);
 339
 340         if (WARN_ON(queue >= hw->queues))
 341                 return;
 342
 343         if (!refcounted)
 344                 local->q_stop_reasons[queue][reason] = 1;
 345         else
 346                 local->q_stop_reasons[queue][reason]++;
 347
 348         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
 349                 return;
 350
 351         if (local->hw.queues < IEEE80211_NUM_ACS)
 352                 n_acs = 1;
 353
 354         rcu_read_lock();
 355         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 356                 int ac;
 357
 358                 if (!sdata->dev)
 359                         continue;
 360
 361                 for (ac = 0; ac < n_acs; ac++) {
 362                         if (sdata->vif.hw_queue[ac] == queue ||
 363                             sdata->vif.cab_queue == queue)
 364                                 netif_stop_subqueue(sdata->dev, ac);
 365                 }
 366         }
 367         rcu_read_unlock();
 368 }
 369
 370 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 371                                     enum queue_stop_reason reason,
 372                                     bool refcounted)
 373 {
 374         struct ieee80211_local *local = hw_to_local(hw);
 375         unsigned long flags;
 376
 377         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 378         __ieee80211_stop_queue(hw, queue, reason, refcounted);
 379         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 380 }
 381
 382 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 383 {
 384         ieee80211_stop_queue_by_reason(hw, queue,
 385                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 386                                        false);
 387 }
 388 EXPORT_SYMBOL(ieee80211_stop_queue);
 389
 390 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 391                                struct sk_buff *skb)
 392 {
 393         struct ieee80211_hw *hw = &local->hw;
 394         unsigned long flags;
 395         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 396         int queue = info->hw_queue;
 397
 398         if (WARN_ON(!info->control.vif)) {
 399                 ieee80211_free_txskb(&local->hw, skb);
 400                 return;
 401         }
 402
 403         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 404         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 405                                false);
 406         __skb_queue_tail(&local->pending[queue], skb);
 407         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 408                                false);
 409         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 410 }
 411
 412 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 413                                 struct sk_buff_head *skbs)
 414 {
 415         struct ieee80211_hw *hw = &local->hw;
 416         struct sk_buff *skb;
 417         unsigned long flags;
 418         int queue, i;
 419
 420         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 421         while ((skb = skb_dequeue(skbs))) {
 422                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 423
 424                 if (WARN_ON(!info->control.vif)) {
 425                         ieee80211_free_txskb(&local->hw, skb);
 426                         continue;
 427                 }
 428
 429                 queue = info->hw_queue;
 430
 431                 __ieee80211_stop_queue(hw, queue,
 432                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 433                                 false);
 434
 435                 __skb_queue_tail(&local->pending[queue], skb);
 436         }
 437
 438         for (i = 0; i < hw->queues; i++)
 439                 __ieee80211_wake_queue(hw, i,
 440                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 441                         false);
 442         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 443 }
 444
 445 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 446                                      unsigned long queues,
 447                                      enum queue_stop_reason reason,
 448                                      bool refcounted)
 449 {
 450         struct ieee80211_local *local = hw_to_local(hw);
 451         unsigned long flags;
 452         int i;
 453
 454         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 455
 456         for_each_set_bit(i, &queues, hw->queues)
 457                 __ieee80211_stop_queue(hw, i, reason, refcounted);
 458
 459         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 460 }
 461
 462 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 463 {
 464         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 465                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 466                                         false);
 467 }
 468 EXPORT_SYMBOL(ieee80211_stop_queues);
 469
 470 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 471 {
 472         struct ieee80211_local *local = hw_to_local(hw);
 473         unsigned long flags;
 474         int ret;
 475
 476         if (WARN_ON(queue >= hw->queues))
 477                 return true;
 478
 479         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 480         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 481                        &local->queue_stop_reasons[queue]);
 482         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483         return ret;
 484 }
 485 EXPORT_SYMBOL(ieee80211_queue_stopped);
 486
 487 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 488                                      unsigned long queues,
 489                                      enum queue_stop_reason reason,
 490                                      bool refcounted)
 491 {
 492         struct ieee80211_local *local = hw_to_local(hw);
 493         unsigned long flags;
 494         int i;
 495
 496         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 497
 498         for_each_set_bit(i, &queues, hw->queues)
 499                 __ieee80211_wake_queue(hw, i, reason, refcounted);
 500
 501         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 502 }
 503
 504 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 505 {
 506         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 507                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 508                                         false);
 509 }
 510 EXPORT_SYMBOL(ieee80211_wake_queues);
 511
 512 static unsigned int
 513 ieee80211_get_vif_queues(struct ieee80211_local *local,
 514                          struct ieee80211_sub_if_data *sdata)
 515 {
 516         unsigned int queues;
 517
 518         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
 519                 int ac;
 520
 521                 queues = 0;
 522
 523                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 524                         queues |= BIT(sdata->vif.hw_queue[ac]);
 525                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 526                         queues |= BIT(sdata->vif.cab_queue);
 527         } else {
 528                 /* all queues */
 529                 queues = BIT(local->hw.queues) - 1;
 530         }
 531
 532         return queues;
 533 }
 534
 535 void __ieee80211_flush_queues(struct ieee80211_local *local,
 536                               struct ieee80211_sub_if_data *sdata,
 537                               unsigned int queues, bool drop)
 538 {
 539         if (!local->ops->flush)
 540                 return;
 541
 542         /*
 543          * If no queue was set, or if the HW doesn't support
 544          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
 545          */
 546         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 547                 queues = ieee80211_get_vif_queues(local, sdata);
 548
 549         ieee80211_stop_queues_by_reason(&local->hw, queues,
 550                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 551                                         false);
 552
 553         drv_flush(local, sdata, queues, drop);
 554
 555         ieee80211_wake_queues_by_reason(&local->hw, queues,
 556                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 557                                         false);
 558 }
 559
 560 void ieee80211_flush_queues(struct ieee80211_local *local,
 561                             struct ieee80211_sub_if_data *sdata, bool drop)
 562 {
 563         __ieee80211_flush_queues(local, sdata, 0, drop);
 564 }
 565
 566 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
 567                                struct ieee80211_sub_if_data *sdata,
 568                                enum queue_stop_reason reason)
 569 {
 570         ieee80211_stop_queues_by_reason(&local->hw,
 571                                         ieee80211_get_vif_queues(local, sdata),
 572                                         reason, true);
 573 }
 574
 575 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
 576                                struct ieee80211_sub_if_data *sdata,
 577                                enum queue_stop_reason reason)
 578 {
 579         ieee80211_wake_queues_by_reason(&local->hw,
 580                                         ieee80211_get_vif_queues(local, sdata),
 581                                         reason, true);
 582 }
 583
 584 static void __iterate_interfaces(struct ieee80211_local *local,
 585                                  u32 iter_flags,
 586                                  void (*iterator)(void *data, u8 *mac,
 587                                                   struct ieee80211_vif *vif),
 588                                  void *data)
 589 {
 590         struct ieee80211_sub_if_data *sdata;
 591         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
 592
 593         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 594                 switch (sdata->vif.type) {
 595                 case NL80211_IFTYPE_MONITOR:
 596                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 597                                 continue;
 598                         break;
 599                 case NL80211_IFTYPE_AP_VLAN:
 600                         continue;
 601                 default:
 602                         break;
 603                 }
 604                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 605                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 606                         continue;
 607                 if (ieee80211_sdata_running(sdata) || !active_only)
 608                         iterator(data, sdata->vif.addr,
 609                                  &sdata->vif);
 610         }
 611
 612         sdata = rcu_dereference_check(local->monitor_sdata,
 613                                       lockdep_is_held(&local->iflist_mtx) ||
 614                                       lockdep_rtnl_is_held());
 615         if (sdata &&
 616             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
 617              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 618                 iterator(data, sdata->vif.addr, &sdata->vif);
 619 }
 620
 621 void ieee80211_iterate_interfaces(
 622         struct ieee80211_hw *hw, u32 iter_flags,
 623         void (*iterator)(void *data, u8 *mac,
 624                          struct ieee80211_vif *vif),
 625         void *data)
 626 {
 627         struct ieee80211_local *local = hw_to_local(hw);
 628
 629         mutex_lock(&local->iflist_mtx);
 630         __iterate_interfaces(local, iter_flags, iterator, data);
 631         mutex_unlock(&local->iflist_mtx);
 632 }
 633 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
 634
 635 void ieee80211_iterate_active_interfaces_atomic(
 636         struct ieee80211_hw *hw, u32 iter_flags,
 637         void (*iterator)(void *data, u8 *mac,
 638                          struct ieee80211_vif *vif),
 639         void *data)
 640 {
 641         struct ieee80211_local *local = hw_to_local(hw);
 642
 643         rcu_read_lock();
 644         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 645                              iterator, data);
 646         rcu_read_unlock();
 647 }
 648 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 649
 650 void ieee80211_iterate_active_interfaces_rtnl(
 651         struct ieee80211_hw *hw, u32 iter_flags,
 652         void (*iterator)(void *data, u8 *mac,
 653                          struct ieee80211_vif *vif),
 654         void *data)
 655 {
 656         struct ieee80211_local *local = hw_to_local(hw);
 657
 658         ASSERT_RTNL();
 659
 660         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 661                              iterator, data);
 662 }
 663 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 664
 665 static void __iterate_stations(struct ieee80211_local *local,
 666                                void (*iterator)(void *data,
 667                                                 struct ieee80211_sta *sta),
 668                                void *data)
 669 {
 670         struct sta_info *sta;
 671
 672         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 673                 if (!sta->uploaded)
 674                         continue;
 675
 676                 iterator(data, &sta->sta);
 677         }
 678 }
 679
 680 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
 681                         void (*iterator)(void *data,
 682                                          struct ieee80211_sta *sta),
 683                         void *data)
 684 {
 685         struct ieee80211_local *local = hw_to_local(hw);
 686
 687         rcu_read_lock();
 688         __iterate_stations(local, iterator, data);
 689         rcu_read_unlock();
 690 }
 691 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
 692
 693 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 694 {
 695         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 696
 697         if (!ieee80211_sdata_running(sdata) ||
 698             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 699                 return NULL;
 700         return &sdata->vif;
 701 }
 702 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 703
 704 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
 705 {
 706         struct ieee80211_sub_if_data *sdata;
 707
 708         if (!vif)
 709                 return NULL;
 710
 711         sdata = vif_to_sdata(vif);
 712
 713         if (!ieee80211_sdata_running(sdata) ||
 714             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 715                 return NULL;
 716
 717         return &sdata->wdev;
 718 }
 719 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
 720
 721 /*
 722  * Nothing should have been stuffed into the workqueue during
 723  * the suspend->resume cycle. Since we can't check each caller
 724  * of this function if we are already quiescing / suspended,
 725  * check here and don't WARN since this can actually happen when
 726  * the rx path (for example) is racing against __ieee80211_suspend
 727  * and suspending / quiescing was set after the rx path checked
 728  * them.
 729  */
 730 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 731 {
 732         if (local->quiescing || (local->suspended && !local->resuming)) {
 733                 pr_warn("queueing ieee80211 work while going to suspend\n");
 734                 return false;
 735         }
 736
 737         return true;
 738 }
 739
 740 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 741 {
 742         struct ieee80211_local *local = hw_to_local(hw);
 743
 744         if (!ieee80211_can_queue_work(local))
 745                 return;
 746
 747         queue_work(local->workqueue, work);
 748 }
 749 EXPORT_SYMBOL(ieee80211_queue_work);
 750
 751 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 752                                   struct delayed_work *dwork,
 753                                   unsigned long delay)
 754 {
 755         struct ieee80211_local *local = hw_to_local(hw);
 756
 757         if (!ieee80211_can_queue_work(local))
 758                 return;
 759
 760         queue_delayed_work(local->workqueue, dwork, delay);
 761 }
 762 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 763
 764 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 765                                struct ieee802_11_elems *elems,
 766                                u64 filter, u32 crc)
 767 {
 768         size_t left = len;
 769         const u8 *pos = start;
 770         bool calc_crc = filter != 0;
 771         DECLARE_BITMAP(seen_elems, 256);
 772         const u8 *ie;
 773
 774         bitmap_zero(seen_elems, 256);
 775         memset(elems, 0, sizeof(*elems));
 776         elems->ie_start = start;
 777         elems->total_len = len;
 778
 779         while (left >= 2) {
 780                 u8 id, elen;
 781                 bool elem_parse_failed;
 782
 783                 id = *pos++;
 784                 elen = *pos++;
 785                 left -= 2;
 786
 787                 if (elen > left) {
 788                         elems->parse_error = true;
 789                         break;
 790                 }
 791
 792                 switch (id) {
 793                 case WLAN_EID_SSID:
 794                 case WLAN_EID_SUPP_RATES:
 795                 case WLAN_EID_FH_PARAMS:
 796                 case WLAN_EID_DS_PARAMS:
 797                 case WLAN_EID_CF_PARAMS:
 798                 case WLAN_EID_TIM:
 799                 case WLAN_EID_IBSS_PARAMS:
 800                 case WLAN_EID_CHALLENGE:
 801                 case WLAN_EID_RSN:
 802                 case WLAN_EID_ERP_INFO:
 803                 case WLAN_EID_EXT_SUPP_RATES:
 804                 case WLAN_EID_HT_CAPABILITY:
 805                 case WLAN_EID_HT_OPERATION:
 806                 case WLAN_EID_VHT_CAPABILITY:
 807                 case WLAN_EID_VHT_OPERATION:
 808                 case WLAN_EID_MESH_ID:
 809                 case WLAN_EID_MESH_CONFIG:
 810                 case WLAN_EID_PEER_MGMT:
 811                 case WLAN_EID_PREQ:
 812                 case WLAN_EID_PREP:
 813                 case WLAN_EID_PERR:
 814                 case WLAN_EID_RANN:
 815                 case WLAN_EID_CHANNEL_SWITCH:
 816                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 817                 case WLAN_EID_COUNTRY:
 818                 case WLAN_EID_PWR_CONSTRAINT:
 819                 case WLAN_EID_TIMEOUT_INTERVAL:
 820                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 821                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 822                 case WLAN_EID_CHAN_SWITCH_PARAM:
 823                 case WLAN_EID_EXT_CAPABILITY:
 824                 case WLAN_EID_CHAN_SWITCH_TIMING:
 825                 case WLAN_EID_LINK_ID:
 826                 /*
 827                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 828                  * that if the content gets bigger it might be needed more than once
 829                  */
 830                         if (test_bit(id, seen_elems)) {
 831                                 elems->parse_error = true;
 832                                 left -= elen;
 833                                 pos += elen;
 834                                 continue;
 835                         }
 836                         break;
 837                 }
 838
 839                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 840                         crc = crc32_be(crc, pos - 2, elen + 2);
 841
 842                 elem_parse_failed = false;
 843
 844                 switch (id) {
 845                 case WLAN_EID_LINK_ID:
 846                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
 847                                 elem_parse_failed = true;
 848                                 break;
 849                         }
 850                         elems->lnk_id = (void *)(pos - 2);
 851                         break;
 852                 case WLAN_EID_CHAN_SWITCH_TIMING:
 853                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
 854                                 elem_parse_failed = true;
 855                                 break;
 856                         }
 857                         elems->ch_sw_timing = (void *)pos;
 858                         break;
 859                 case WLAN_EID_EXT_CAPABILITY:
 860                         elems->ext_capab = pos;
 861                         elems->ext_capab_len = elen;
 862                         break;
 863                 case WLAN_EID_SSID:
 864                         elems->ssid = pos;
 865                         elems->ssid_len = elen;
 866                         break;
 867                 case WLAN_EID_SUPP_RATES:
 868                         elems->supp_rates = pos;
 869                         elems->supp_rates_len = elen;
 870                         break;
 871                 case WLAN_EID_DS_PARAMS:
 872                         if (elen >= 1)
 873                                 elems->ds_params = pos;
 874                         else
 875                                 elem_parse_failed = true;
 876                         break;
 877                 case WLAN_EID_TIM:
 878                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 879                                 elems->tim = (void *)pos;
 880                                 elems->tim_len = elen;
 881                         } else
 882                                 elem_parse_failed = true;
 883                         break;
 884                 case WLAN_EID_CHALLENGE:
 885                         elems->challenge = pos;
 886                         elems->challenge_len = elen;
 887                         break;
 888                 case WLAN_EID_VENDOR_SPECIFIC:
 889                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 890                             pos[2] == 0xf2) {
 891                                 /* Microsoft OUI (00:50:F2) */
 892
 893                                 if (calc_crc)
 894                                         crc = crc32_be(crc, pos - 2, elen + 2);
 895
 896                                 if (elen >= 5 && pos[3] == 2) {
 897                                         /* OUI Type 2 - WMM IE */
 898                                         if (pos[4] == 0) {
 899                                                 elems->wmm_info = pos;
 900                                                 elems->wmm_info_len = elen;
 901                                         } else if (pos[4] == 1) {
 902                                                 elems->wmm_param = pos;
 903                                                 elems->wmm_param_len = elen;
 904                                         }
 905                                 }
 906                         }
 907                         break;
 908                 case WLAN_EID_RSN:
 909                         elems->rsn = pos;
 910                         elems->rsn_len = elen;
 911                         break;
 912                 case WLAN_EID_ERP_INFO:
 913                         if (elen >= 1)
 914                                 elems->erp_info = pos;
 915                         else
 916                                 elem_parse_failed = true;
 917                         break;
 918                 case WLAN_EID_EXT_SUPP_RATES:
 919                         elems->ext_supp_rates = pos;
 920                         elems->ext_supp_rates_len = elen;
 921                         break;
 922                 case WLAN_EID_HT_CAPABILITY:
 923                         if (elen >= sizeof(struct ieee80211_ht_cap))
 924                                 elems->ht_cap_elem = (void *)pos;
 925                         else
 926                                 elem_parse_failed = true;
 927                         break;
 928                 case WLAN_EID_HT_OPERATION:
 929                         if (elen >= sizeof(struct ieee80211_ht_operation))
 930                                 elems->ht_operation = (void *)pos;
 931                         else
 932                                 elem_parse_failed = true;
 933                         break;
 934                 case WLAN_EID_VHT_CAPABILITY:
 935                         if (elen >= sizeof(struct ieee80211_vht_cap))
 936                                 elems->vht_cap_elem = (void *)pos;
 937                         else
 938                                 elem_parse_failed = true;
 939                         break;
 940                 case WLAN_EID_VHT_OPERATION:
 941                         if (elen >= sizeof(struct ieee80211_vht_operation))
 942                                 elems->vht_operation = (void *)pos;
 943                         else
 944                                 elem_parse_failed = true;
 945                         break;
 946                 case WLAN_EID_OPMODE_NOTIF:
 947                         if (elen > 0)
 948                                 elems->opmode_notif = pos;
 949                         else
 950                                 elem_parse_failed = true;
 951                         break;
 952                 case WLAN_EID_MESH_ID:
 953                         elems->mesh_id = pos;
 954                         elems->mesh_id_len = elen;
 955                         break;
 956                 case WLAN_EID_MESH_CONFIG:
 957                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 958                                 elems->mesh_config = (void *)pos;
 959                         else
 960                                 elem_parse_failed = true;
 961                         break;
 962                 case WLAN_EID_PEER_MGMT:
 963                         elems->peering = pos;
 964                         elems->peering_len = elen;
 965                         break;
 966                 case WLAN_EID_MESH_AWAKE_WINDOW:
 967                         if (elen >= 2)
 968                                 elems->awake_window = (void *)pos;
 969                         break;
 970                 case WLAN_EID_PREQ:
 971                         elems->preq = pos;
 972                         elems->preq_len = elen;
 973                         break;
 974                 case WLAN_EID_PREP:
 975                         elems->prep = pos;
 976                         elems->prep_len = elen;
 977                         break;
 978                 case WLAN_EID_PERR:
 979                         elems->perr = pos;
 980                         elems->perr_len = elen;
 981                         break;
 982                 case WLAN_EID_RANN:
 983                         if (elen >= sizeof(struct ieee80211_rann_ie))
 984                                 elems->rann = (void *)pos;
 985                         else
 986                                 elem_parse_failed = true;
 987                         break;
 988                 case WLAN_EID_CHANNEL_SWITCH:
 989                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 990                                 elem_parse_failed = true;
 991                                 break;
 992                         }
 993                         elems->ch_switch_ie = (void *)pos;
 994                         break;
 995                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 996                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 997                                 elem_parse_failed = true;
 998                                 break;
 999                         }
1000                         elems->ext_chansw_ie = (void *)pos;
1001                         break;
1002                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1003                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1004                                 elem_parse_failed = true;
1005                                 break;
1006                         }
1007                         elems->sec_chan_offs = (void *)pos;
1008                         break;
1009                 case WLAN_EID_CHAN_SWITCH_PARAM:
1010                         if (elen !=
1011                             sizeof(*elems->mesh_chansw_params_ie)) {
1012                                 elem_parse_failed = true;
1013                                 break;
1014                         }
1015                         elems->mesh_chansw_params_ie = (void *)pos;
1016                         break;
1017                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1018                         if (!action ||
1019                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1020                                 elem_parse_failed = true;
1021                                 break;
1022                         }
1023                         elems->wide_bw_chansw_ie = (void *)pos;
1024                         break;
1025                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1026                         if (action) {
1027                                 elem_parse_failed = true;
1028                                 break;
1029                         }
1030                         /*
1031                          * This is a bit tricky, but as we only care about
1032                          * the wide bandwidth channel switch element, so
1033                          * just parse it out manually.
1034                          */
1035                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1036                                               pos, elen);
1037                         if (ie) {
1038                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1039                                         elems->wide_bw_chansw_ie =
1040                                                 (void *)(ie + 2);
1041                                 else
1042                                         elem_parse_failed = true;
1043                         }
1044                         break;
1045                 case WLAN_EID_COUNTRY:
1046                         elems->country_elem = pos;
1047                         elems->country_elem_len = elen;
1048                         break;
1049                 case WLAN_EID_PWR_CONSTRAINT:
1050                         if (elen != 1) {
1051                                 elem_parse_failed = true;
1052                                 break;
1053                         }
1054                         elems->pwr_constr_elem = pos;
1055                         break;
1056                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1057                         /* Lots of different options exist, but we only care
1058                          * about the Dynamic Transmit Power Control element.
1059                          * First check for the Cisco OUI, then for the DTPC
1060                          * tag (0x00).
1061                          */
1062                         if (elen < 4) {
1063                                 elem_parse_failed = true;
1064                                 break;
1065                         }
1066
1067                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1068                             pos[2] != 0x96 || pos[3] != 0x00)
1069                                 break;
1070
1071                         if (elen != 6) {
1072                                 elem_parse_failed = true;
1073                                 break;
1074                         }
1075
1076                         if (calc_crc)
1077                                 crc = crc32_be(crc, pos - 2, elen + 2);
1078
1079                         elems->cisco_dtpc_elem = pos;
1080                         break;
1081                 case WLAN_EID_TIMEOUT_INTERVAL:
1082                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1083                                 elems->timeout_int = (void *)pos;
1084                         else
1085                                 elem_parse_failed = true;
1086                         break;
1087                 default:
1088                         break;
1089                 }
1090
1091                 if (elem_parse_failed)
1092                         elems->parse_error = true;
1093                 else
1094                         __set_bit(id, seen_elems);
1095
1096                 left -= elen;
1097                 pos += elen;
1098         }
1099
1100         if (left != 0)
1101                 elems->parse_error = true;
1102
1103         return crc;
1104 }
1105
1106 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1107                                bool bss_notify)
1108 {
1109         struct ieee80211_local *local = sdata->local;
1110         struct ieee80211_tx_queue_params qparam;
1111         struct ieee80211_chanctx_conf *chanctx_conf;
1112         int ac;
1113         bool use_11b, enable_qos;
1114         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1115         int aCWmin, aCWmax;
1116
1117         if (!local->ops->conf_tx)
1118                 return;
1119
1120         if (local->hw.queues < IEEE80211_NUM_ACS)
1121                 return;
1122
1123         memset(&qparam, 0, sizeof(qparam));
1124
1125         rcu_read_lock();
1126         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1127         use_11b = (chanctx_conf &&
1128                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1129                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1130         rcu_read_unlock();
1131
1132         /*
1133          * By default disable QoS in STA mode for old access points, which do
1134          * not support 802.11e. New APs will provide proper queue parameters,
1135          * that we will configure later.
1136          */
1137         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1138
1139         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1140
1141         /* Set defaults according to 802.11-2007 Table 7-37 */
1142         aCWmax = 1023;
1143         if (use_11b)
1144                 aCWmin = 31;
1145         else
1146                 aCWmin = 15;
1147
1148         /* Confiure old 802.11b/g medium access rules. */
1149         qparam.cw_max = aCWmax;
1150         qparam.cw_min = aCWmin;
1151         qparam.txop = 0;
1152         qparam.aifs = 2;
1153
1154         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1155                 /* Update if QoS is enabled. */
1156                 if (enable_qos) {
1157                         switch (ac) {
1158                         case IEEE80211_AC_BK:
1159                                 qparam.cw_max = aCWmax;
1160                                 qparam.cw_min = aCWmin;
1161                                 qparam.txop = 0;
1162                                 if (is_ocb)
1163                                         qparam.aifs = 9;
1164                                 else
1165                                         qparam.aifs = 7;
1166                                 break;
1167                         /* never happens but let's not leave undefined */
1168                         default:
1169                         case IEEE80211_AC_BE:
1170                                 qparam.cw_max = aCWmax;
1171                                 qparam.cw_min = aCWmin;
1172                                 qparam.txop = 0;
1173                                 if (is_ocb)
1174                                         qparam.aifs = 6;
1175                                 else
1176                                         qparam.aifs = 3;
1177                                 break;
1178                         case IEEE80211_AC_VI:
1179                                 qparam.cw_max = aCWmin;
1180                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1181                                 if (is_ocb)
1182                                         qparam.txop = 0;
1183                                 else if (use_11b)
1184                                         qparam.txop = 6016/32;
1185                                 else
1186                                         qparam.txop = 3008/32;
1187
1188                                 if (is_ocb)
1189                                         qparam.aifs = 3;
1190                                 else
1191                                         qparam.aifs = 2;
1192                                 break;
1193                         case IEEE80211_AC_VO:
1194                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1195                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1196                                 if (is_ocb)
1197                                         qparam.txop = 0;
1198                                 else if (use_11b)
1199                                         qparam.txop = 3264/32;
1200                                 else
1201                                         qparam.txop = 1504/32;
1202                                 qparam.aifs = 2;
1203                                 break;
1204                         }
1205                 }
1206
1207                 qparam.uapsd = false;
1208
1209                 sdata->tx_conf[ac] = qparam;
1210                 drv_conf_tx(local, sdata, ac, &qparam);
1211         }
1212
1213         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1214             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1215                 sdata->vif.bss_conf.qos = enable_qos;
1216                 if (bss_notify)
1217                         ieee80211_bss_info_change_notify(sdata,
1218                                                          BSS_CHANGED_QOS);
1219         }
1220 }
1221
1222 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1223                          u16 transaction, u16 auth_alg, u16 status,
1224                          const u8 *extra, size_t extra_len, const u8 *da,
1225                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1226                          u32 tx_flags)
1227 {
1228         struct ieee80211_local *local = sdata->local;
1229         struct sk_buff *skb;
1230         struct ieee80211_mgmt *mgmt;
1231         int err;
1232
1233         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1234         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1235                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1236         if (!skb)
1237                 return;
1238
1239         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1240
1241         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1242         memset(mgmt, 0, 24 + 6);
1243         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1244                                           IEEE80211_STYPE_AUTH);
1245         memcpy(mgmt->da, da, ETH_ALEN);
1246         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1247         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1248         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1249         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1250         mgmt->u.auth.status_code = cpu_to_le16(status);
1251         if (extra)
1252                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1253
1254         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1255                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1256                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1257                 WARN_ON(err);
1258         }
1259
1260         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1261                                         tx_flags;
1262         ieee80211_tx_skb(sdata, skb);
1263 }
1264
1265 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1266                                     const u8 *bssid, u16 stype, u16 reason,
1267                                     bool send_frame, u8 *frame_buf)
1268 {
1269         struct ieee80211_local *local = sdata->local;
1270         struct sk_buff *skb;
1271         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1272
1273         /* build frame */
1274         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1275         mgmt->duration = 0; /* initialize only */
1276         mgmt->seq_ctrl = 0; /* initialize only */
1277         memcpy(mgmt->da, bssid, ETH_ALEN);
1278         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1279         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1280         /* u.deauth.reason_code == u.disassoc.reason_code */
1281         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1282
1283         if (send_frame) {
1284                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1285                                     IEEE80211_DEAUTH_FRAME_LEN);
1286                 if (!skb)
1287                         return;
1288
1289                 skb_reserve(skb, local->hw.extra_tx_headroom);
1290
1291                 /* copy in frame */
1292                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1293                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1294
1295                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1296                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1297                         IEEE80211_SKB_CB(skb)->flags |=
1298                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1299
1300                 ieee80211_tx_skb(sdata, skb);
1301         }
1302 }
1303
1304 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1305                                          u8 *buffer, size_t buffer_len,
1306                                          const u8 *ie, size_t ie_len,
1307                                          enum ieee80211_band band,
1308                                          u32 rate_mask,
1309                                          struct cfg80211_chan_def *chandef,
1310                                          size_t *offset)
1311 {
1312         struct ieee80211_supported_band *sband;
1313         u8 *pos = buffer, *end = buffer + buffer_len;
1314         size_t noffset;
1315         int supp_rates_len, i;
1316         u8 rates[32];
1317         int num_rates;
1318         int ext_rates_len;
1319         int shift;
1320         u32 rate_flags;
1321         bool have_80mhz = false;
1322
1323         *offset = 0;
1324
1325         sband = local->hw.wiphy->bands[band];
1326         if (WARN_ON_ONCE(!sband))
1327                 return 0;
1328
1329         rate_flags = ieee80211_chandef_rate_flags(chandef);
1330         shift = ieee80211_chandef_get_shift(chandef);
1331
1332         num_rates = 0;
1333         for (i = 0; i < sband->n_bitrates; i++) {
1334                 if ((BIT(i) & rate_mask) == 0)
1335                         continue; /* skip rate */
1336                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1337                         continue;
1338
1339                 rates[num_rates++] =
1340                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1341                                           (1 << shift) * 5);
1342         }
1343
1344         supp_rates_len = min_t(int, num_rates, 8);
1345
1346         if (end - pos < 2 + supp_rates_len)
1347                 goto out_err;
1348         *pos++ = WLAN_EID_SUPP_RATES;
1349         *pos++ = supp_rates_len;
1350         memcpy(pos, rates, supp_rates_len);
1351         pos += supp_rates_len;
1352
1353         /* insert "request information" if in custom IEs */
1354         if (ie && ie_len) {
1355                 static const u8 before_extrates[] = {
1356                         WLAN_EID_SSID,
1357                         WLAN_EID_SUPP_RATES,
1358                         WLAN_EID_REQUEST,
1359                 };
1360                 noffset = ieee80211_ie_split(ie, ie_len,
1361                                              before_extrates,
1362                                              ARRAY_SIZE(before_extrates),
1363                                              *offset);
1364                 if (end - pos < noffset - *offset)
1365                         goto out_err;
1366                 memcpy(pos, ie + *offset, noffset - *offset);
1367                 pos += noffset - *offset;
1368                 *offset = noffset;
1369         }
1370
1371         ext_rates_len = num_rates - supp_rates_len;
1372         if (ext_rates_len > 0) {
1373                 if (end - pos < 2 + ext_rates_len)
1374                         goto out_err;
1375                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1376                 *pos++ = ext_rates_len;
1377                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1378                 pos += ext_rates_len;
1379         }
1380
1381         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1382                 if (end - pos < 3)
1383                         goto out_err;
1384                 *pos++ = WLAN_EID_DS_PARAMS;
1385                 *pos++ = 1;
1386                 *pos++ = ieee80211_frequency_to_channel(
1387                                 chandef->chan->center_freq);
1388         }
1389
1390         /* insert custom IEs that go before HT */
1391         if (ie && ie_len) {
1392                 static const u8 before_ht[] = {
1393                         WLAN_EID_SSID,
1394                         WLAN_EID_SUPP_RATES,
1395                         WLAN_EID_REQUEST,
1396                         WLAN_EID_EXT_SUPP_RATES,
1397                         WLAN_EID_DS_PARAMS,
1398                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1399                 };
1400                 noffset = ieee80211_ie_split(ie, ie_len,
1401                                              before_ht, ARRAY_SIZE(before_ht),
1402                                              *offset);
1403                 if (end - pos < noffset - *offset)
1404                         goto out_err;
1405                 memcpy(pos, ie + *offset, noffset - *offset);
1406                 pos += noffset - *offset;
1407                 *offset = noffset;
1408         }
1409
1410         if (sband->ht_cap.ht_supported) {
1411                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1412                         goto out_err;
1413                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1414                                                 sband->ht_cap.cap);
1415         }
1416
1417         /*
1418          * If adding more here, adjust code in main.c
1419          * that calculates local->scan_ies_len.
1420          */
1421
1422         /* insert custom IEs that go before VHT */
1423         if (ie && ie_len) {
1424                 static const u8 before_vht[] = {
1425                         WLAN_EID_SSID,
1426                         WLAN_EID_SUPP_RATES,
1427                         WLAN_EID_REQUEST,
1428                         WLAN_EID_EXT_SUPP_RATES,
1429                         WLAN_EID_DS_PARAMS,
1430                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1431                         WLAN_EID_HT_CAPABILITY,
1432                         WLAN_EID_BSS_COEX_2040,
1433                         WLAN_EID_EXT_CAPABILITY,
1434                         WLAN_EID_SSID_LIST,
1435                         WLAN_EID_CHANNEL_USAGE,
1436                         WLAN_EID_INTERWORKING,
1437                         /* mesh ID can't happen here */
1438                         /* 60 GHz can't happen here right now */
1439                 };
1440                 noffset = ieee80211_ie_split(ie, ie_len,
1441                                              before_vht, ARRAY_SIZE(before_vht),
1442                                              *offset);
1443                 if (end - pos < noffset - *offset)
1444                         goto out_err;
1445                 memcpy(pos, ie + *offset, noffset - *offset);
1446                 pos += noffset - *offset;
1447                 *offset = noffset;
1448         }
1449
1450         /* Check if any channel in this sband supports at least 80 MHz */
1451         for (i = 0; i < sband->n_channels; i++) {
1452                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1453                                                 IEEE80211_CHAN_NO_80MHZ))
1454                         continue;
1455
1456                 have_80mhz = true;
1457                 break;
1458         }
1459
1460         if (sband->vht_cap.vht_supported && have_80mhz) {
1461                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1462                         goto out_err;
1463                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1464                                                  sband->vht_cap.cap);
1465         }
1466
1467         return pos - buffer;
1468  out_err:
1469         WARN_ONCE(1, "not enough space for preq IEs\n");
1470         return pos - buffer;
1471 }
1472
1473 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1474                              size_t buffer_len,
1475                              struct ieee80211_scan_ies *ie_desc,
1476                              const u8 *ie, size_t ie_len,
1477                              u8 bands_used, u32 *rate_masks,
1478                              struct cfg80211_chan_def *chandef)
1479 {
1480         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1481         int i;
1482
1483         memset(ie_desc, 0, sizeof(*ie_desc));
1484
1485         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1486                 if (bands_used & BIT(i)) {
1487                         pos += ieee80211_build_preq_ies_band(local,
1488                                                              buffer + pos,
1489                                                              buffer_len - pos,
1490                                                              ie, ie_len, i,
1491                                                              rate_masks[i],
1492                                                              chandef,
1493                                                              &custom_ie_offset);
1494                         ie_desc->ies[i] = buffer + old_pos;
1495                         ie_desc->len[i] = pos - old_pos;
1496                         old_pos = pos;
1497                 }
1498         }
1499
1500         /* add any remaining custom IEs */
1501         if (ie && ie_len) {
1502                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1503                               "not enough space for preq custom IEs\n"))
1504                         return pos;
1505                 memcpy(buffer + pos, ie + custom_ie_offset,
1506                        ie_len - custom_ie_offset);
1507                 ie_desc->common_ies = buffer + pos;
1508                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1509                 pos += ie_len - custom_ie_offset;
1510         }
1511
1512         return pos;
1513 };
1514
1515 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1516                                           const u8 *src, const u8 *dst,
1517                                           u32 ratemask,
1518                                           struct ieee80211_channel *chan,
1519                                           const u8 *ssid, size_t ssid_len,
1520                                           const u8 *ie, size_t ie_len,
1521                                           bool directed)
1522 {
1523         struct ieee80211_local *local = sdata->local;
1524         struct cfg80211_chan_def chandef;
1525         struct sk_buff *skb;
1526         struct ieee80211_mgmt *mgmt;
1527         int ies_len;
1528         u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1529         struct ieee80211_scan_ies dummy_ie_desc;
1530
1531         /*
1532          * Do not send DS Channel parameter for directed probe requests
1533          * in order to maximize the chance that we get a response.  Some
1534          * badly-behaved APs don't respond when this parameter is included.
1535          */
1536         chandef.width = sdata->vif.bss_conf.chandef.width;
1537         if (directed)
1538                 chandef.chan = NULL;
1539         else
1540                 chandef.chan = chan;
1541
1542         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1543                                      100 + ie_len);
1544         if (!skb)
1545                 return NULL;
1546
1547         rate_masks[chan->band] = ratemask;
1548         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1549                                            skb_tailroom(skb), &dummy_ie_desc,
1550                                            ie, ie_len, BIT(chan->band),
1551                                            rate_masks, &chandef);
1552         skb_put(skb, ies_len);
1553
1554         if (dst) {
1555                 mgmt = (struct ieee80211_mgmt *) skb->data;
1556                 memcpy(mgmt->da, dst, ETH_ALEN);
1557                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1558         }
1559
1560         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1561
1562         return skb;
1563 }
1564
1565 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1566                               const u8 *src, const u8 *dst,
1567                               const u8 *ssid, size_t ssid_len,
1568                               const u8 *ie, size_t ie_len,
1569                               u32 ratemask, bool directed, u32 tx_flags,
1570                               struct ieee80211_channel *channel, bool scan)
1571 {
1572         struct sk_buff *skb;
1573
1574         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1575                                         ssid, ssid_len,
1576                                         ie, ie_len, directed);
1577         if (skb) {
1578                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1579                 if (scan)
1580                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1581                 else
1582                         ieee80211_tx_skb(sdata, skb);
1583         }
1584 }
1585
1586 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1587                             struct ieee802_11_elems *elems,
1588                             enum ieee80211_band band, u32 *basic_rates)
1589 {
1590         struct ieee80211_supported_band *sband;
1591         size_t num_rates;
1592         u32 supp_rates, rate_flags;
1593         int i, j, shift;
1594         sband = sdata->local->hw.wiphy->bands[band];
1595
1596         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1597         shift = ieee80211_vif_get_shift(&sdata->vif);
1598
1599         if (WARN_ON(!sband))
1600                 return 1;
1601
1602         num_rates = sband->n_bitrates;
1603         supp_rates = 0;
1604         for (i = 0; i < elems->supp_rates_len +
1605                      elems->ext_supp_rates_len; i++) {
1606                 u8 rate = 0;
1607                 int own_rate;
1608                 bool is_basic;
1609                 if (i < elems->supp_rates_len)
1610                         rate = elems->supp_rates[i];
1611                 else if (elems->ext_supp_rates)
1612                         rate = elems->ext_supp_rates
1613                                 [i - elems->supp_rates_len];
1614                 own_rate = 5 * (rate & 0x7f);
1615                 is_basic = !!(rate & 0x80);
1616
1617                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1618                         continue;
1619
1620                 for (j = 0; j < num_rates; j++) {
1621                         int brate;
1622                         if ((rate_flags & sband->bitrates[j].flags)
1623                             != rate_flags)
1624                                 continue;
1625
1626                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1627                                              1 << shift);
1628
1629                         if (brate == own_rate) {
1630                                 supp_rates |= BIT(j);
1631                                 if (basic_rates && is_basic)
1632                                         *basic_rates |= BIT(j);
1633                         }
1634                 }
1635         }
1636         return supp_rates;
1637 }
1638
1639 void ieee80211_stop_device(struct ieee80211_local *local)
1640 {
1641         ieee80211_led_radio(local, false);
1642         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1643
1644         cancel_work_sync(&local->reconfig_filter);
1645
1646         flush_workqueue(local->workqueue);
1647         drv_stop(local);
1648 }
1649
1650 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1651 {
1652         struct ieee80211_sub_if_data *sdata;
1653         struct ieee80211_chanctx *ctx;
1654
1655         /*
1656          * We get here if during resume the device can't be restarted properly.
1657          * We might also get here if this happens during HW reset, which is a
1658          * slightly different situation and we need to drop all connections in
1659          * the latter case.
1660          *
1661          * Ask cfg80211 to turn off all interfaces, this will result in more
1662          * warnings but at least we'll then get into a clean stopped state.
1663          */
1664
1665         local->resuming = false;
1666         local->suspended = false;
1667         local->started = false;
1668         local->in_reconfig = false;
1669
1670         /* scheduled scan clearly can't be running any more, but tell
1671          * cfg80211 and clear local state
1672          */
1673         ieee80211_sched_scan_end(local);
1674
1675         list_for_each_entry(sdata, &local->interfaces, list)
1676                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1677
1678         /* Mark channel contexts as not being in the driver any more to avoid
1679          * removing them from the driver during the shutdown process...
1680          */
1681         mutex_lock(&local->chanctx_mtx);
1682         list_for_each_entry(ctx, &local->chanctx_list, list)
1683                 ctx->driver_present = false;
1684         mutex_unlock(&local->chanctx_mtx);
1685
1686         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1687 }
1688
1689 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1690                                      struct ieee80211_sub_if_data *sdata)
1691 {
1692         struct ieee80211_chanctx_conf *conf;
1693         struct ieee80211_chanctx *ctx;
1694
1695         if (!local->use_chanctx)
1696                 return;
1697
1698         mutex_lock(&local->chanctx_mtx);
1699         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1700                                          lockdep_is_held(&local->chanctx_mtx));
1701         if (conf) {
1702                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1703                 drv_assign_vif_chanctx(local, sdata, ctx);
1704         }
1705         mutex_unlock(&local->chanctx_mtx);
1706 }
1707
1708 int ieee80211_reconfig(struct ieee80211_local *local)
1709 {
1710         struct ieee80211_hw *hw = &local->hw;
1711         struct ieee80211_sub_if_data *sdata;
1712         struct ieee80211_chanctx *ctx;
1713         struct sta_info *sta;
1714         int res, i;
1715         bool reconfig_due_to_wowlan = false;
1716         struct ieee80211_sub_if_data *sched_scan_sdata;
1717         struct cfg80211_sched_scan_request *sched_scan_req;
1718         bool sched_scan_stopped = false;
1719
1720         /* nothing to do if HW shouldn't run */
1721         if (!local->open_count)
1722                 goto wake_up;
1723
1724 #ifdef CONFIG_PM
1725         if (local->suspended)
1726                 local->resuming = true;
1727
1728         if (local->wowlan) {
1729                 res = drv_resume(local);
1730                 local->wowlan = false;
1731                 if (res < 0) {
1732                         local->resuming = false;
1733                         return res;
1734                 }
1735                 if (res == 0)
1736                         goto wake_up;
1737                 WARN_ON(res > 1);
1738                 /*
1739                  * res is 1, which means the driver requested
1740                  * to go through a regular reset on wakeup.
1741                  */
1742                 reconfig_due_to_wowlan = true;
1743         }
1744 #endif
1745
1746         /*
1747          * Upon resume hardware can sometimes be goofy due to
1748          * various platform / driver / bus issues, so restarting
1749          * the device may at times not work immediately. Propagate
1750          * the error.
1751          */
1752         res = drv_start(local);
1753         if (res) {
1754                 if (local->suspended)
1755                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1756                 else
1757                         WARN(1, "Hardware became unavailable during restart.\n");
1758                 ieee80211_handle_reconfig_failure(local);
1759                 return res;
1760         }
1761
1762         /* setup fragmentation threshold */
1763         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1764
1765         /* setup RTS threshold */
1766         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1767
1768         /* reset coverage class */
1769         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1770
1771         ieee80211_led_radio(local, true);
1772         ieee80211_mod_tpt_led_trig(local,
1773                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1774
1775         /* add interfaces */
1776         sdata = rtnl_dereference(local->monitor_sdata);
1777         if (sdata) {
1778                 /* in HW restart it exists already */
1779                 WARN_ON(local->resuming);
1780                 res = drv_add_interface(local, sdata);
1781                 if (WARN_ON(res)) {
1782                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1783                         synchronize_net();
1784                         kfree(sdata);
1785                 }
1786         }
1787
1788         list_for_each_entry(sdata, &local->interfaces, list) {
1789                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1790                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1791                     ieee80211_sdata_running(sdata)) {
1792                         res = drv_add_interface(local, sdata);
1793                         if (WARN_ON(res))
1794                                 break;
1795                 }
1796         }
1797
1798         /* If adding any of the interfaces failed above, roll back and
1799          * report failure.
1800          */
1801         if (res) {
1802                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1803                                                      list)
1804                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1805                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1806                             ieee80211_sdata_running(sdata))
1807                                 drv_remove_interface(local, sdata);
1808                 ieee80211_handle_reconfig_failure(local);
1809                 return res;
1810         }
1811
1812         /* add channel contexts */
1813         if (local->use_chanctx) {
1814                 mutex_lock(&local->chanctx_mtx);
1815                 list_for_each_entry(ctx, &local->chanctx_list, list)
1816                         if (ctx->replace_state !=
1817                             IEEE80211_CHANCTX_REPLACES_OTHER)
1818                                 WARN_ON(drv_add_chanctx(local, ctx));
1819                 mutex_unlock(&local->chanctx_mtx);
1820
1821                 list_for_each_entry(sdata, &local->interfaces, list) {
1822                         if (!ieee80211_sdata_running(sdata))
1823                                 continue;
1824                         ieee80211_assign_chanctx(local, sdata);
1825                 }
1826
1827                 sdata = rtnl_dereference(local->monitor_sdata);
1828                 if (sdata && ieee80211_sdata_running(sdata))
1829                         ieee80211_assign_chanctx(local, sdata);
1830         }
1831
1832         /* add STAs back */
1833         mutex_lock(&local->sta_mtx);
1834         list_for_each_entry(sta, &local->sta_list, list) {
1835                 enum ieee80211_sta_state state;
1836
1837                 if (!sta->uploaded)
1838                         continue;
1839
1840                 /* AP-mode stations will be added later */
1841                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1842                         continue;
1843
1844                 for (state = IEEE80211_STA_NOTEXIST;
1845                      state < sta->sta_state; state++)
1846                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1847                                               state + 1));
1848         }
1849         mutex_unlock(&local->sta_mtx);
1850
1851         /* reconfigure tx conf */
1852         if (hw->queues >= IEEE80211_NUM_ACS) {
1853                 list_for_each_entry(sdata, &local->interfaces, list) {
1854                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1855                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1856                             !ieee80211_sdata_running(sdata))
1857                                 continue;
1858
1859                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1860                                 drv_conf_tx(local, sdata, i,
1861                                             &sdata->tx_conf[i]);
1862                 }
1863         }
1864
1865         /* reconfigure hardware */
1866         ieee80211_hw_config(local, ~0);
1867
1868         ieee80211_configure_filter(local);
1869
1870         /* Finally also reconfigure all the BSS information */
1871         list_for_each_entry(sdata, &local->interfaces, list) {
1872                 u32 changed;
1873
1874                 if (!ieee80211_sdata_running(sdata))
1875                         continue;
1876
1877                 /* common change flags for all interface types */
1878                 changed = BSS_CHANGED_ERP_CTS_PROT |
1879                           BSS_CHANGED_ERP_PREAMBLE |
1880                           BSS_CHANGED_ERP_SLOT |
1881                           BSS_CHANGED_HT |
1882                           BSS_CHANGED_BASIC_RATES |
1883                           BSS_CHANGED_BEACON_INT |
1884                           BSS_CHANGED_BSSID |
1885                           BSS_CHANGED_CQM |
1886                           BSS_CHANGED_QOS |
1887                           BSS_CHANGED_IDLE |
1888                           BSS_CHANGED_TXPOWER;
1889
1890                 switch (sdata->vif.type) {
1891                 case NL80211_IFTYPE_STATION:
1892                         changed |= BSS_CHANGED_ASSOC |
1893                                    BSS_CHANGED_ARP_FILTER |
1894                                    BSS_CHANGED_PS;
1895
1896                         /* Re-send beacon info report to the driver */
1897                         if (sdata->u.mgd.have_beacon)
1898                                 changed |= BSS_CHANGED_BEACON_INFO;
1899
1900                         sdata_lock(sdata);
1901                         ieee80211_bss_info_change_notify(sdata, changed);
1902                         sdata_unlock(sdata);
1903                         break;
1904                 case NL80211_IFTYPE_OCB:
1905                         changed |= BSS_CHANGED_OCB;
1906                         ieee80211_bss_info_change_notify(sdata, changed);
1907                         break;
1908                 case NL80211_IFTYPE_ADHOC:
1909                         changed |= BSS_CHANGED_IBSS;
1910                         /* fall through */
1911                 case NL80211_IFTYPE_AP:
1912                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1913
1914                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1915                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1916
1917                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1918                                         drv_start_ap(local, sdata);
1919                         }
1920
1921                         /* fall through */
1922                 case NL80211_IFTYPE_MESH_POINT:
1923                         if (sdata->vif.bss_conf.enable_beacon) {
1924                                 changed |= BSS_CHANGED_BEACON |
1925                                            BSS_CHANGED_BEACON_ENABLED;
1926                                 ieee80211_bss_info_change_notify(sdata, changed);
1927                         }
1928                         break;
1929                 case NL80211_IFTYPE_WDS:
1930                 case NL80211_IFTYPE_AP_VLAN:
1931                 case NL80211_IFTYPE_MONITOR:
1932                 case NL80211_IFTYPE_P2P_DEVICE:
1933                         /* nothing to do */
1934                         break;
1935                 case NL80211_IFTYPE_UNSPECIFIED:
1936                 case NUM_NL80211_IFTYPES:
1937                 case NL80211_IFTYPE_P2P_CLIENT:
1938                 case NL80211_IFTYPE_P2P_GO:
1939                         WARN_ON(1);
1940                         break;
1941                 }
1942         }
1943
1944         ieee80211_recalc_ps(local, -1);
1945
1946         /*
1947          * The sta might be in psm against the ap (e.g. because
1948          * this was the state before a hw restart), so we
1949          * explicitly send a null packet in order to make sure
1950          * it'll sync against the ap (and get out of psm).
1951          */
1952         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1953                 list_for_each_entry(sdata, &local->interfaces, list) {
1954                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1955                                 continue;
1956                         if (!sdata->u.mgd.associated)
1957                                 continue;
1958
1959                         ieee80211_send_nullfunc(local, sdata, 0);
1960                 }
1961         }
1962
1963         /* APs are now beaconing, add back stations */
1964         mutex_lock(&local->sta_mtx);
1965         list_for_each_entry(sta, &local->sta_list, list) {
1966                 enum ieee80211_sta_state state;
1967
1968                 if (!sta->uploaded)
1969                         continue;
1970
1971                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1972                         continue;
1973
1974                 for (state = IEEE80211_STA_NOTEXIST;
1975                      state < sta->sta_state; state++)
1976                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1977                                               state + 1));
1978         }
1979         mutex_unlock(&local->sta_mtx);
1980
1981         /* add back keys */
1982         list_for_each_entry(sdata, &local->interfaces, list)
1983                 ieee80211_reset_crypto_tx_tailroom(sdata);
1984
1985         list_for_each_entry(sdata, &local->interfaces, list)
1986                 if (ieee80211_sdata_running(sdata))
1987                         ieee80211_enable_keys(sdata);
1988
1989  wake_up:
1990         local->in_reconfig = false;
1991         barrier();
1992
1993         if (local->monitors == local->open_count && local->monitors > 0)
1994                 ieee80211_add_virtual_monitor(local);
1995
1996         /*
1997          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1998          * sessions can be established after a resume.
1999          *
2000          * Also tear down aggregation sessions since reconfiguring
2001          * them in a hardware restart scenario is not easily done
2002          * right now, and the hardware will have lost information
2003          * about the sessions, but we and the AP still think they
2004          * are active. This is really a workaround though.
2005          */
2006         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2007                 mutex_lock(&local->sta_mtx);
2008
2009                 list_for_each_entry(sta, &local->sta_list, list) {
2010                         ieee80211_sta_tear_down_BA_sessions(
2011                                         sta, AGG_STOP_LOCAL_REQUEST);
2012                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2013                 }
2014
2015                 mutex_unlock(&local->sta_mtx);
2016         }
2017
2018         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2019                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2020                                         false);
2021
2022         /*
2023          * Reconfigure sched scan if it was interrupted by FW restart or
2024          * suspend.
2025          */
2026         mutex_lock(&local->mtx);
2027         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2028                                                 lockdep_is_held(&local->mtx));
2029         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2030                                                 lockdep_is_held(&local->mtx));
2031         if (sched_scan_sdata && sched_scan_req)
2032                 /*
2033                  * Sched scan stopped, but we don't want to report it. Instead,
2034                  * we're trying to reschedule.
2035                  */
2036                 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
2037                                                          sched_scan_req))
2038                         sched_scan_stopped = true;
2039         mutex_unlock(&local->mtx);
2040
2041         if (sched_scan_stopped)
2042                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2043
2044         /*
2045          * If this is for hw restart things are still running.
2046          * We may want to change that later, however.
2047          */
2048         if (local->open_count && (!local->suspended || reconfig_due_to_wowlan))
2049                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2050
2051         if (!local->suspended)
2052                 return 0;
2053
2054 #ifdef CONFIG_PM
2055         /* first set suspended false, then resuming */
2056         local->suspended = false;
2057         mb();
2058         local->resuming = false;
2059
2060         /* It's possible that we don't handle the scan completion in
2061          * time during suspend, so if it's still marked as completed
2062          * here, queue the work and flush it to clean things up.
2063          * Instead of calling the worker function directly here, we
2064          * really queue it to avoid potential races with other flows
2065          * scheduling the same work.
2066          */
2067         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
2068                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
2069                 flush_delayed_work(&local->scan_work);
2070         }
2071
2072         if (local->open_count && !reconfig_due_to_wowlan)
2073                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2074
2075         list_for_each_entry(sdata, &local->interfaces, list) {
2076                 if (!ieee80211_sdata_running(sdata))
2077                         continue;
2078                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2079                         ieee80211_sta_restart(sdata);
2080         }
2081
2082         mod_timer(&local->sta_cleanup, jiffies + 1);
2083 #else
2084         WARN_ON(1);
2085 #endif
2086
2087         return 0;
2088 }
2089
2090 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2091 {
2092         struct ieee80211_sub_if_data *sdata;
2093         struct ieee80211_local *local;
2094         struct ieee80211_key *key;
2095
2096         if (WARN_ON(!vif))
2097                 return;
2098
2099         sdata = vif_to_sdata(vif);
2100         local = sdata->local;
2101
2102         if (WARN_ON(!local->resuming))
2103                 return;
2104
2105         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2106                 return;
2107
2108         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2109
2110         mutex_lock(&local->key_mtx);
2111         list_for_each_entry(key, &sdata->key_list, list)
2112                 key->flags |= KEY_FLAG_TAINTED;
2113         mutex_unlock(&local->key_mtx);
2114 }
2115 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2116
2117 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2118 {
2119         struct ieee80211_local *local = sdata->local;
2120         struct ieee80211_chanctx_conf *chanctx_conf;
2121         struct ieee80211_chanctx *chanctx;
2122
2123         mutex_lock(&local->chanctx_mtx);
2124
2125         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2126                                         lockdep_is_held(&local->chanctx_mtx));
2127
2128         if (WARN_ON_ONCE(!chanctx_conf))
2129                 goto unlock;
2130
2131         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2132         ieee80211_recalc_smps_chanctx(local, chanctx);
2133  unlock:
2134         mutex_unlock(&local->chanctx_mtx);
2135 }
2136
2137 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2138 {
2139         struct ieee80211_local *local = sdata->local;
2140         struct ieee80211_chanctx_conf *chanctx_conf;
2141         struct ieee80211_chanctx *chanctx;
2142
2143         mutex_lock(&local->chanctx_mtx);
2144
2145         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2146                                         lockdep_is_held(&local->chanctx_mtx));
2147
2148         if (WARN_ON_ONCE(!chanctx_conf))
2149                 goto unlock;
2150
2151         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2152         ieee80211_recalc_chanctx_min_def(local, chanctx);
2153  unlock:
2154         mutex_unlock(&local->chanctx_mtx);
2155 }
2156
2157 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2158 {
2159         size_t pos = offset;
2160
2161         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2162                 pos += 2 + ies[pos + 1];
2163
2164         return pos;
2165 }
2166
2167 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2168                                             int rssi_min_thold,
2169                                             int rssi_max_thold)
2170 {
2171         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2172
2173         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2174                 return;
2175
2176         /*
2177          * Scale up threshold values before storing it, as the RSSI averaging
2178          * algorithm uses a scaled up value as well. Change this scaling
2179          * factor if the RSSI averaging algorithm changes.
2180          */
2181         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2182         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2183 }
2184
2185 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2186                                     int rssi_min_thold,
2187                                     int rssi_max_thold)
2188 {
2189         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2190
2191         WARN_ON(rssi_min_thold == rssi_max_thold ||
2192                 rssi_min_thold > rssi_max_thold);
2193
2194         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2195                                        rssi_max_thold);
2196 }
2197 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2198
2199 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2200 {
2201         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2202
2203         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2204 }
2205 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2206
2207 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2208                               u16 cap)
2209 {
2210         __le16 tmp;
2211
2212         *pos++ = WLAN_EID_HT_CAPABILITY;
2213         *pos++ = sizeof(struct ieee80211_ht_cap);
2214         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2215
2216         /* capability flags */
2217         tmp = cpu_to_le16(cap);
2218         memcpy(pos, &tmp, sizeof(u16));
2219         pos += sizeof(u16);
2220
2221         /* AMPDU parameters */
2222         *pos++ = ht_cap->ampdu_factor |
2223                  (ht_cap->ampdu_density <<
2224                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2225
2226         /* MCS set */
2227         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2228         pos += sizeof(ht_cap->mcs);
2229
2230         /* extended capabilities */
2231         pos += sizeof(__le16);
2232
2233         /* BF capabilities */
2234         pos += sizeof(__le32);
2235
2236         /* antenna selection */
2237         pos += sizeof(u8);
2238
2239         return pos;
2240 }
2241
2242 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2243                                u32 cap)
2244 {
2245         __le32 tmp;
2246
2247         *pos++ = WLAN_EID_VHT_CAPABILITY;
2248         *pos++ = sizeof(struct ieee80211_vht_cap);
2249         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2250
2251         /* capability flags */
2252         tmp = cpu_to_le32(cap);
2253         memcpy(pos, &tmp, sizeof(u32));
2254         pos += sizeof(u32);
2255
2256         /* VHT MCS set */
2257         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2258         pos += sizeof(vht_cap->vht_mcs);
2259
2260         return pos;
2261 }
2262
2263 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2264                                const struct cfg80211_chan_def *chandef,
2265                                u16 prot_mode)
2266 {
2267         struct ieee80211_ht_operation *ht_oper;
2268         /* Build HT Information */
2269         *pos++ = WLAN_EID_HT_OPERATION;
2270         *pos++ = sizeof(struct ieee80211_ht_operation);
2271         ht_oper = (struct ieee80211_ht_operation *)pos;
2272         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2273                                         chandef->chan->center_freq);
2274         switch (chandef->width) {
2275         case NL80211_CHAN_WIDTH_160:
2276         case NL80211_CHAN_WIDTH_80P80:
2277         case NL80211_CHAN_WIDTH_80:
2278         case NL80211_CHAN_WIDTH_40:
2279                 if (chandef->center_freq1 > chandef->chan->center_freq)
2280                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2281                 else
2282                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2283                 break;
2284         default:
2285                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2286                 break;
2287         }
2288         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2289             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2290             chandef->width != NL80211_CHAN_WIDTH_20)
2291                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2292
2293         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2294         ht_oper->stbc_param = 0x0000;
2295
2296         /* It seems that Basic MCS set and Supported MCS set
2297            are identical for the first 10 bytes */
2298         memset(&ht_oper->basic_set, 0, 16);
2299         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2300
2301         return pos + sizeof(struct ieee80211_ht_operation);
2302 }
2303
2304 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2305                                 const struct cfg80211_chan_def *chandef)
2306 {
2307         struct ieee80211_vht_operation *vht_oper;
2308
2309         *pos++ = WLAN_EID_VHT_OPERATION;
2310         *pos++ = sizeof(struct ieee80211_vht_operation);
2311         vht_oper = (struct ieee80211_vht_operation *)pos;
2312         vht_oper->center_freq_seg1_idx = ieee80211_frequency_to_channel(
2313                                                         chandef->center_freq1);
2314         if (chandef->center_freq2)
2315                 vht_oper->center_freq_seg2_idx =
2316                         ieee80211_frequency_to_channel(chandef->center_freq2);
2317
2318         switch (chandef->width) {
2319         case NL80211_CHAN_WIDTH_160:
2320                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_160MHZ;
2321                 break;
2322         case NL80211_CHAN_WIDTH_80P80:
2323                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
2324                 break;
2325         case NL80211_CHAN_WIDTH_80:
2326                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2327                 break;
2328         default:
2329                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2330                 break;
2331         }
2332
2333         /* don't require special VHT peer rates */
2334         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2335
2336         return pos + sizeof(struct ieee80211_vht_operation);
2337 }
2338
2339 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2340                                   const struct ieee80211_ht_operation *ht_oper,
2341                                   struct cfg80211_chan_def *chandef)
2342 {
2343         enum nl80211_channel_type channel_type;
2344
2345         if (!ht_oper) {
2346                 cfg80211_chandef_create(chandef, control_chan,
2347                                         NL80211_CHAN_NO_HT);
2348                 return;
2349         }
2350
2351         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2352         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2353                 channel_type = NL80211_CHAN_HT20;
2354                 break;
2355         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2356                 channel_type = NL80211_CHAN_HT40PLUS;
2357                 break;
2358         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2359                 channel_type = NL80211_CHAN_HT40MINUS;
2360                 break;
2361         default:
2362                 channel_type = NL80211_CHAN_NO_HT;
2363         }
2364
2365         cfg80211_chandef_create(chandef, control_chan, channel_type);
2366 }
2367
2368 void ieee80211_vht_oper_to_chandef(struct ieee80211_channel *control_chan,
2369                                    const struct ieee80211_vht_operation *oper,
2370                                    struct cfg80211_chan_def *chandef)
2371 {
2372         if (!oper)
2373                 return;
2374
2375         chandef->chan = control_chan;
2376
2377         switch (oper->chan_width) {
2378         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2379                 break;
2380         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2381                 chandef->width = NL80211_CHAN_WIDTH_80;
2382                 break;
2383         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2384                 chandef->width = NL80211_CHAN_WIDTH_160;
2385                 break;
2386         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2387                 chandef->width = NL80211_CHAN_WIDTH_80P80;
2388                 break;
2389         default:
2390                 break;
2391         }
2392
2393         chandef->center_freq1 =
2394                 ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2395                                                control_chan->band);
2396         chandef->center_freq2 =
2397                 ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
2398                                                control_chan->band);
2399 }
2400
2401 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2402                              const struct ieee80211_supported_band *sband,
2403                              const u8 *srates, int srates_len, u32 *rates)
2404 {
2405         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2406         int shift = ieee80211_chandef_get_shift(chandef);
2407         struct ieee80211_rate *br;
2408         int brate, rate, i, j, count = 0;
2409
2410         *rates = 0;
2411
2412         for (i = 0; i < srates_len; i++) {
2413                 rate = srates[i] & 0x7f;
2414
2415                 for (j = 0; j < sband->n_bitrates; j++) {
2416                         br = &sband->bitrates[j];
2417                         if ((rate_flags & br->flags) != rate_flags)
2418                                 continue;
2419
2420                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2421                         if (brate == rate) {
2422                                 *rates |= BIT(j);
2423                                 count++;
2424                                 break;
2425                         }
2426                 }
2427         }
2428         return count;
2429 }
2430
2431 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2432                             struct sk_buff *skb, bool need_basic,
2433                             enum ieee80211_band band)
2434 {
2435         struct ieee80211_local *local = sdata->local;
2436         struct ieee80211_supported_band *sband;
2437         int rate, shift;
2438         u8 i, rates, *pos;
2439         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2440         u32 rate_flags;
2441
2442         shift = ieee80211_vif_get_shift(&sdata->vif);
2443         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2444         sband = local->hw.wiphy->bands[band];
2445         rates = 0;
2446         for (i = 0; i < sband->n_bitrates; i++) {
2447                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2448                         continue;
2449                 rates++;
2450         }
2451         if (rates > 8)
2452                 rates = 8;
2453
2454         if (skb_tailroom(skb) < rates + 2)
2455                 return -ENOMEM;
2456
2457         pos = skb_put(skb, rates + 2);
2458         *pos++ = WLAN_EID_SUPP_RATES;
2459         *pos++ = rates;
2460         for (i = 0; i < rates; i++) {
2461                 u8 basic = 0;
2462                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2463                         continue;
2464
2465                 if (need_basic && basic_rates & BIT(i))
2466                         basic = 0x80;
2467                 rate = sband->bitrates[i].bitrate;
2468                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2469                                     5 * (1 << shift));
2470                 *pos++ = basic | (u8) rate;
2471         }
2472
2473         return 0;
2474 }
2475
2476 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2477                                 struct sk_buff *skb, bool need_basic,
2478                                 enum ieee80211_band band)
2479 {
2480         struct ieee80211_local *local = sdata->local;
2481         struct ieee80211_supported_band *sband;
2482         int rate, shift;
2483         u8 i, exrates, *pos;
2484         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2485         u32 rate_flags;
2486
2487         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2488         shift = ieee80211_vif_get_shift(&sdata->vif);
2489
2490         sband = local->hw.wiphy->bands[band];
2491         exrates = 0;
2492         for (i = 0; i < sband->n_bitrates; i++) {
2493                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2494                         continue;
2495                 exrates++;
2496         }
2497
2498         if (exrates > 8)
2499                 exrates -= 8;
2500         else
2501                 exrates = 0;
2502
2503         if (skb_tailroom(skb) < exrates + 2)
2504                 return -ENOMEM;
2505
2506         if (exrates) {
2507                 pos = skb_put(skb, exrates + 2);
2508                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2509                 *pos++ = exrates;
2510                 for (i = 8; i < sband->n_bitrates; i++) {
2511                         u8 basic = 0;
2512                         if ((rate_flags & sband->bitrates[i].flags)
2513                             != rate_flags)
2514                                 continue;
2515                         if (need_basic && basic_rates & BIT(i))
2516                                 basic = 0x80;
2517                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2518                                             5 * (1 << shift));
2519                         *pos++ = basic | (u8) rate;
2520                 }
2521         }
2522         return 0;
2523 }
2524
2525 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2526 {
2527         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2528         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2529
2530         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2531                 /* non-managed type inferfaces */
2532                 return 0;
2533         }
2534         return ifmgd->ave_beacon_signal / 16;
2535 }
2536 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2537
2538 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2539 {
2540         if (!mcs)
2541                 return 1;
2542
2543         /* TODO: consider rx_highest */
2544
2545         if (mcs->rx_mask[3])
2546                 return 4;
2547         if (mcs->rx_mask[2])
2548                 return 3;
2549         if (mcs->rx_mask[1])
2550                 return 2;
2551         return 1;
2552 }
2553
2554 /**
2555  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2556  * @local: mac80211 hw info struct
2557  * @status: RX status
2558  * @mpdu_len: total MPDU length (including FCS)
2559  * @mpdu_offset: offset into MPDU to calculate timestamp at
2560  *
2561  * This function calculates the RX timestamp at the given MPDU offset, taking
2562  * into account what the RX timestamp was. An offset of 0 will just normalize
2563  * the timestamp to TSF at beginning of MPDU reception.
2564  */
2565 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2566                                      struct ieee80211_rx_status *status,
2567                                      unsigned int mpdu_len,
2568                                      unsigned int mpdu_offset)
2569 {
2570         u64 ts = status->mactime;
2571         struct rate_info ri;
2572         u16 rate;
2573
2574         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2575                 return 0;
2576
2577         memset(&ri, 0, sizeof(ri));
2578
2579         /* Fill cfg80211 rate info */
2580         if (status->flag & RX_FLAG_HT) {
2581                 ri.mcs = status->rate_idx;
2582                 ri.flags |= RATE_INFO_FLAGS_MCS;
2583                 if (status->flag & RX_FLAG_40MHZ)
2584                         ri.bw = RATE_INFO_BW_40;
2585                 else
2586                         ri.bw = RATE_INFO_BW_20;
2587                 if (status->flag & RX_FLAG_SHORT_GI)
2588                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2589         } else if (status->flag & RX_FLAG_VHT) {
2590                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2591                 ri.mcs = status->rate_idx;
2592                 ri.nss = status->vht_nss;
2593                 if (status->flag & RX_FLAG_40MHZ)
2594                         ri.bw = RATE_INFO_BW_40;
2595                 else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2596                         ri.bw = RATE_INFO_BW_80;
2597                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2598                         ri.bw = RATE_INFO_BW_160;
2599                 else
2600                         ri.bw = RATE_INFO_BW_20;
2601                 if (status->flag & RX_FLAG_SHORT_GI)
2602                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2603         } else {
2604                 struct ieee80211_supported_band *sband;
2605                 int shift = 0;
2606                 int bitrate;
2607
2608                 if (status->flag & RX_FLAG_10MHZ) {
2609                         shift = 1;
2610                         ri.bw = RATE_INFO_BW_10;
2611                 } else if (status->flag & RX_FLAG_5MHZ) {
2612                         shift = 2;
2613                         ri.bw = RATE_INFO_BW_5;
2614                 } else {
2615                         ri.bw = RATE_INFO_BW_20;
2616                 }
2617
2618                 sband = local->hw.wiphy->bands[status->band];
2619                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2620                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2621         }
2622
2623         rate = cfg80211_calculate_bitrate(&ri);
2624         if (WARN_ONCE(!rate,
2625                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2626                       status->flag, status->rate_idx, status->vht_nss))
2627                 return 0;
2628
2629         /* rewind from end of MPDU */
2630         if (status->flag & RX_FLAG_MACTIME_END)
2631                 ts -= mpdu_len * 8 * 10 / rate;
2632
2633         ts += mpdu_offset * 8 * 10 / rate;
2634
2635         return ts;
2636 }
2637
2638 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2639 {
2640         struct ieee80211_sub_if_data *sdata;
2641         struct cfg80211_chan_def chandef;
2642
2643         mutex_lock(&local->mtx);
2644         mutex_lock(&local->iflist_mtx);
2645         list_for_each_entry(sdata, &local->interfaces, list) {
2646                 /* it might be waiting for the local->mtx, but then
2647                  * by the time it gets it, sdata->wdev.cac_started
2648                  * will no longer be true
2649                  */
2650                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2651
2652                 if (sdata->wdev.cac_started) {
2653                         chandef = sdata->vif.bss_conf.chandef;
2654                         ieee80211_vif_release_channel(sdata);
2655                         cfg80211_cac_event(sdata->dev,
2656                                            &chandef,
2657                                            NL80211_RADAR_CAC_ABORTED,
2658                                            GFP_KERNEL);
2659                 }
2660         }
2661         mutex_unlock(&local->iflist_mtx);
2662         mutex_unlock(&local->mtx);
2663 }
2664
2665 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2666 {
2667         struct ieee80211_local *local =
2668                 container_of(work, struct ieee80211_local, radar_detected_work);
2669         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2670         struct ieee80211_chanctx *ctx;
2671         int num_chanctx = 0;
2672
2673         mutex_lock(&local->chanctx_mtx);
2674         list_for_each_entry(ctx, &local->chanctx_list, list) {
2675                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2676                         continue;
2677
2678                 num_chanctx++;
2679                 chandef = ctx->conf.def;
2680         }
2681         mutex_unlock(&local->chanctx_mtx);
2682
2683         ieee80211_dfs_cac_cancel(local);
2684
2685         if (num_chanctx > 1)
2686                 /* XXX: multi-channel is not supported yet */
2687                 WARN_ON(1);
2688         else
2689                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2690 }
2691
2692 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2693 {
2694         struct ieee80211_local *local = hw_to_local(hw);
2695
2696         trace_api_radar_detected(local);
2697
2698         ieee80211_queue_work(hw, &local->radar_detected_work);
2699 }
2700 EXPORT_SYMBOL(ieee80211_radar_detected);
2701
2702 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2703 {
2704         u32 ret;
2705         int tmp;
2706
2707         switch (c->width) {
2708         case NL80211_CHAN_WIDTH_20:
2709                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2710                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2711                 break;
2712         case NL80211_CHAN_WIDTH_40:
2713                 c->width = NL80211_CHAN_WIDTH_20;
2714                 c->center_freq1 = c->chan->center_freq;
2715                 ret = IEEE80211_STA_DISABLE_40MHZ |
2716                       IEEE80211_STA_DISABLE_VHT;
2717                 break;
2718         case NL80211_CHAN_WIDTH_80:
2719                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2720                 /* n_P40 */
2721                 tmp /= 2;
2722                 /* freq_P40 */
2723                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2724                 c->width = NL80211_CHAN_WIDTH_40;
2725                 ret = IEEE80211_STA_DISABLE_VHT;
2726                 break;
2727         case NL80211_CHAN_WIDTH_80P80:
2728                 c->center_freq2 = 0;
2729                 c->width = NL80211_CHAN_WIDTH_80;
2730                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2731                       IEEE80211_STA_DISABLE_160MHZ;
2732                 break;
2733         case NL80211_CHAN_WIDTH_160:
2734                 /* n_P20 */
2735                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2736                 /* n_P80 */
2737                 tmp /= 4;
2738                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2739                 c->width = NL80211_CHAN_WIDTH_80;
2740                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2741                       IEEE80211_STA_DISABLE_160MHZ;
2742                 break;
2743         default:
2744         case NL80211_CHAN_WIDTH_20_NOHT:
2745                 WARN_ON_ONCE(1);
2746                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2747                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2748                 break;
2749         case NL80211_CHAN_WIDTH_5:
2750         case NL80211_CHAN_WIDTH_10:
2751                 WARN_ON_ONCE(1);
2752                 /* keep c->width */
2753                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2754                 break;
2755         }
2756
2757         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2758
2759         return ret;
2760 }
2761
2762 /*
2763  * Returns true if smps_mode_new is strictly more restrictive than
2764  * smps_mode_old.
2765  */
2766 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2767                                    enum ieee80211_smps_mode smps_mode_new)
2768 {
2769         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2770                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2771                 return false;
2772
2773         switch (smps_mode_old) {
2774         case IEEE80211_SMPS_STATIC:
2775                 return false;
2776         case IEEE80211_SMPS_DYNAMIC:
2777                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2778         case IEEE80211_SMPS_OFF:
2779                 return smps_mode_new != IEEE80211_SMPS_OFF;
2780         default:
2781                 WARN_ON(1);
2782         }
2783
2784         return false;
2785 }
2786
2787 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2788                               struct cfg80211_csa_settings *csa_settings)
2789 {
2790         struct sk_buff *skb;
2791         struct ieee80211_mgmt *mgmt;
2792         struct ieee80211_local *local = sdata->local;
2793         int freq;
2794         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2795                                sizeof(mgmt->u.action.u.chan_switch);
2796         u8 *pos;
2797
2798         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2799             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2800                 return -EOPNOTSUPP;
2801
2802         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2803                             5 + /* channel switch announcement element */
2804                             3 + /* secondary channel offset element */
2805                             8); /* mesh channel switch parameters element */
2806         if (!skb)
2807                 return -ENOMEM;
2808
2809         skb_reserve(skb, local->tx_headroom);
2810         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2811         memset(mgmt, 0, hdr_len);
2812         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2813                                           IEEE80211_STYPE_ACTION);
2814
2815         eth_broadcast_addr(mgmt->da);
2816         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2817         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2818                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2819         } else {
2820                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2821                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2822         }
2823         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2824         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2825         pos = skb_put(skb, 5);
2826         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2827         *pos++ = 3;                                             /* IE length */
2828         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2829         freq = csa_settings->chandef.chan->center_freq;
2830         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2831         *pos++ = csa_settings->count;                           /* count */
2832
2833         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2834                 enum nl80211_channel_type ch_type;
2835
2836                 skb_put(skb, 3);
2837                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2838                 *pos++ = 1;                                     /* IE length */
2839                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2840                 if (ch_type == NL80211_CHAN_HT40PLUS)
2841                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2842                 else
2843                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2844         }
2845
2846         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2847                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2848
2849                 skb_put(skb, 8);
2850                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2851                 *pos++ = 6;                                     /* IE length */
2852                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2853                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2854                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2855                 *pos++ |= csa_settings->block_tx ?
2856                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2857                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2858                 pos += 2;
2859                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2860                 pos += 2;
2861         }
2862
2863         ieee80211_tx_skb(sdata, skb);
2864         return 0;
2865 }
2866
2867 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2868 {
2869         return !(cs == NULL || cs->cipher == 0 ||
2870                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2871                  cs->hdr_len <= cs->key_idx_off ||
2872                  cs->key_idx_shift > 7 ||
2873                  cs->key_idx_mask == 0);
2874 }
2875
2876 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2877 {
2878         int i;
2879
2880         /* Ensure we have enough iftype bitmap space for all iftype values */
2881         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2882
2883         for (i = 0; i < n; i++)
2884                 if (!ieee80211_cs_valid(&cs[i]))
2885                         return false;
2886
2887         return true;
2888 }
2889
2890 const struct ieee80211_cipher_scheme *
2891 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2892                  enum nl80211_iftype iftype)
2893 {
2894         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2895         int n = local->hw.n_cipher_schemes;
2896         int i;
2897         const struct ieee80211_cipher_scheme *cs = NULL;
2898
2899         for (i = 0; i < n; i++) {
2900                 if (l[i].cipher == cipher) {
2901                         cs = &l[i];
2902                         break;
2903                 }
2904         }
2905
2906         if (!cs || !(cs->iftype & BIT(iftype)))
2907                 return NULL;
2908
2909         return cs;
2910 }
2911
2912 int ieee80211_cs_headroom(struct ieee80211_local *local,
2913                           struct cfg80211_crypto_settings *crypto,
2914                           enum nl80211_iftype iftype)
2915 {
2916         const struct ieee80211_cipher_scheme *cs;
2917         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2918         int i;
2919
2920         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2921                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2922                                       iftype);
2923
2924                 if (cs && headroom < cs->hdr_len)
2925                         headroom = cs->hdr_len;
2926         }
2927
2928         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2929         if (cs && headroom < cs->hdr_len)
2930                 headroom = cs->hdr_len;
2931
2932         return headroom;
2933 }
2934
2935 static bool
2936 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2937 {
2938         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2939         int skip;
2940
2941         if (end > 0)
2942                 return false;
2943
2944         /* End time is in the past, check for repetitions */
2945         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2946         if (data->count[i] < 255) {
2947                 if (data->count[i] <= skip) {
2948                         data->count[i] = 0;
2949                         return false;
2950                 }
2951
2952                 data->count[i] -= skip;
2953         }
2954
2955         data->desc[i].start += skip * data->desc[i].interval;
2956
2957         return true;
2958 }
2959
2960 static bool
2961 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2962                              s32 *offset)
2963 {
2964         bool ret = false;
2965         int i;
2966
2967         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2968                 s32 cur;
2969
2970                 if (!data->count[i])
2971                         continue;
2972
2973                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2974                         ret = true;
2975
2976                 cur = data->desc[i].start - tsf;
2977                 if (cur > *offset)
2978                         continue;
2979
2980                 cur = data->desc[i].start + data->desc[i].duration - tsf;
2981                 if (cur > *offset)
2982                         *offset = cur;
2983         }
2984
2985         return ret;
2986 }
2987
2988 static u32
2989 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2990 {
2991         s32 offset = 0;
2992         int tries = 0;
2993         /*
2994          * arbitrary limit, used to avoid infinite loops when combined NoA
2995          * descriptors cover the full time period.
2996          */
2997         int max_tries = 5;
2998
2999         ieee80211_extend_absent_time(data, tsf, &offset);
3000         do {
3001                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3002                         break;
3003
3004                 tries++;
3005         } while (tries < max_tries);
3006
3007         return offset;
3008 }
3009
3010 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3011 {
3012         u32 next_offset = BIT(31) - 1;
3013         int i;
3014
3015         data->absent = 0;
3016         data->has_next_tsf = false;
3017         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3018                 s32 start;
3019
3020                 if (!data->count[i])
3021                         continue;
3022
3023                 ieee80211_extend_noa_desc(data, tsf, i);
3024                 start = data->desc[i].start - tsf;
3025                 if (start <= 0)
3026                         data->absent |= BIT(i);
3027
3028                 if (next_offset > start)
3029                         next_offset = start;
3030
3031                 data->has_next_tsf = true;
3032         }
3033
3034         if (data->absent)
3035                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3036
3037         data->next_tsf = tsf + next_offset;
3038 }
3039 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3040
3041 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3042                             struct ieee80211_noa_data *data, u32 tsf)
3043 {
3044         int ret = 0;
3045         int i;
3046
3047         memset(data, 0, sizeof(*data));
3048
3049         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3050                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3051
3052                 if (!desc->count || !desc->duration)
3053                         continue;
3054
3055                 data->count[i] = desc->count;
3056                 data->desc[i].start = le32_to_cpu(desc->start_time);
3057                 data->desc[i].duration = le32_to_cpu(desc->duration);
3058                 data->desc[i].interval = le32_to_cpu(desc->interval);
3059
3060                 if (data->count[i] > 1 &&
3061                     data->desc[i].interval < data->desc[i].duration)
3062                         continue;
3063
3064                 ieee80211_extend_noa_desc(data, tsf, i);
3065                 ret++;
3066         }
3067
3068         if (ret)
3069                 ieee80211_update_p2p_noa(data, tsf);
3070
3071         return ret;
3072 }
3073 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3074
3075 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3076                            struct ieee80211_sub_if_data *sdata)
3077 {
3078         u64 tsf = drv_get_tsf(local, sdata);
3079         u64 dtim_count = 0;
3080         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3081         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3082         struct ps_data *ps;
3083         u8 bcns_from_dtim;
3084
3085         if (tsf == -1ULL || !beacon_int || !dtim_period)
3086                 return;
3087
3088         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3089             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3090                 if (!sdata->bss)
3091                         return;
3092
3093                 ps = &sdata->bss->ps;
3094         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3095                 ps = &sdata->u.mesh.ps;
3096         } else {
3097                 return;
3098         }
3099
3100         /*
3101          * actually finds last dtim_count, mac80211 will update in
3102          * __beacon_add_tim().
3103          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3104          */
3105         do_div(tsf, beacon_int);
3106         bcns_from_dtim = do_div(tsf, dtim_period);
3107         /* just had a DTIM */
3108         if (!bcns_from_dtim)
3109                 dtim_count = 0;
3110         else
3111                 dtim_count = dtim_period - bcns_from_dtim;
3112
3113         ps->dtim_count = dtim_count;
3114 }
3115
3116 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3117                                          struct ieee80211_chanctx *ctx)
3118 {
3119         struct ieee80211_sub_if_data *sdata;
3120         u8 radar_detect = 0;
3121
3122         lockdep_assert_held(&local->chanctx_mtx);
3123
3124         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3125                 return 0;
3126
3127         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3128                 if (sdata->reserved_radar_required)
3129                         radar_detect |= BIT(sdata->reserved_chandef.width);
3130
3131         /*
3132          * An in-place reservation context should not have any assigned vifs
3133          * until it replaces the other context.
3134          */
3135         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3136                 !list_empty(&ctx->assigned_vifs));
3137
3138         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3139                 if (sdata->radar_required)
3140                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3141
3142         return radar_detect;
3143 }
3144
3145 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3146                                  const struct cfg80211_chan_def *chandef,
3147                                  enum ieee80211_chanctx_mode chanmode,
3148                                  u8 radar_detect)
3149 {
3150         struct ieee80211_local *local = sdata->local;
3151         struct ieee80211_sub_if_data *sdata_iter;
3152         enum nl80211_iftype iftype = sdata->wdev.iftype;
3153         int num[NUM_NL80211_IFTYPES];
3154         struct ieee80211_chanctx *ctx;
3155         int num_different_channels = 0;
3156         int total = 1;
3157
3158         lockdep_assert_held(&local->chanctx_mtx);
3159
3160         if (WARN_ON(hweight32(radar_detect) > 1))
3161                 return -EINVAL;
3162
3163         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3164                     !chandef->chan))
3165                 return -EINVAL;
3166
3167         if (chandef)
3168                 num_different_channels = 1;
3169
3170         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3171                 return -EINVAL;
3172
3173         /* Always allow software iftypes */
3174         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3175                 if (radar_detect)
3176                         return -EINVAL;
3177                 return 0;
3178         }
3179
3180         memset(num, 0, sizeof(num));
3181
3182         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3183                 num[iftype] = 1;
3184
3185         list_for_each_entry(ctx, &local->chanctx_list, list) {
3186                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3187                         continue;
3188                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3189                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3190                         num_different_channels++;
3191                         continue;
3192                 }
3193                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3194                     cfg80211_chandef_compatible(chandef,
3195                                                 &ctx->conf.def))
3196                         continue;
3197                 num_different_channels++;
3198         }
3199
3200         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3201                 struct wireless_dev *wdev_iter;
3202
3203                 wdev_iter = &sdata_iter->wdev;
3204
3205                 if (sdata_iter == sdata ||
3206                     !ieee80211_sdata_running(sdata_iter) ||
3207                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3208                         continue;
3209
3210                 num[wdev_iter->iftype]++;
3211                 total++;
3212         }
3213
3214         if (total == 1 && !radar_detect)
3215                 return 0;
3216
3217         return cfg80211_check_combinations(local->hw.wiphy,
3218                                            num_different_channels,
3219                                            radar_detect, num);
3220 }
3221
3222 static void
3223 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3224                          void *data)
3225 {
3226         u32 *max_num_different_channels = data;
3227
3228         *max_num_different_channels = max(*max_num_different_channels,
3229                                           c->num_different_channels);
3230 }
3231
3232 int ieee80211_max_num_channels(struct ieee80211_local *local)
3233 {
3234         struct ieee80211_sub_if_data *sdata;
3235         int num[NUM_NL80211_IFTYPES] = {};
3236         struct ieee80211_chanctx *ctx;
3237         int num_different_channels = 0;
3238         u8 radar_detect = 0;
3239         u32 max_num_different_channels = 1;
3240         int err;
3241
3242         lockdep_assert_held(&local->chanctx_mtx);
3243
3244         list_for_each_entry(ctx, &local->chanctx_list, list) {
3245                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3246                         continue;
3247
3248                 num_different_channels++;
3249
3250                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3251         }
3252
3253         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3254                 num[sdata->wdev.iftype]++;
3255
3256         err = cfg80211_iter_combinations(local->hw.wiphy,
3257                                          num_different_channels, radar_detect,
3258                                          num, ieee80211_iter_max_chans,
3259                                          &max_num_different_channels);
3260         if (err < 0)
3261                 return err;
3262
3263         return max_num_different_channels;
3264 }
3265
3266 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3267 {
3268         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3269         *buf++ = 7; /* len */
3270         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3271         *buf++ = 0x50;
3272         *buf++ = 0xf2;
3273         *buf++ = 2; /* WME */
3274         *buf++ = 0; /* WME info */
3275         *buf++ = 1; /* WME ver */
3276         *buf++ = qosinfo; /* U-APSD no in use */
3277
3278         return buf;
3279 }
3280
3281 void ieee80211_init_tx_queue(struct ieee80211_sub_if_data *sdata,
3282                              struct sta_info *sta,
3283                              struct txq_info *txqi, int tid)
3284 {
3285         skb_queue_head_init(&txqi->queue);
3286         txqi->txq.vif = &sdata->vif;
3287
3288         if (sta) {
3289                 txqi->txq.sta = &sta->sta;
3290                 sta->sta.txq[tid] = &txqi->txq;
3291                 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
3292         } else {
3293                 sdata->vif.txq = &txqi->txq;
3294                 txqi->txq.ac = IEEE80211_AC_BE;
3295         }
3296 }